\begin{tabular}{lcccc} \hline
 & (1) & (2) & (3) & (4) \\
VARIABLES & Orig. EI & New EI & Orig. SI & New SI \\ \hline
 &  &  &  &  \\
Education years & -0.0523 & -0.0257 & -0.0516 & -0.129*** \\
 & (0.0561) & (0.0577) & (0.0541) & (0.0463) \\
Constant & 0.0757*** & 0.0651*** & 0.0428*** & 0.0138** \\
 & (0.00672) & (0.00691) & (0.00647) & (0.00555) \\
 &  &  &  &  \\
Observations & 1,560 & 1,560 & 1,560 & 1,560 \\
R-squared & 0.708 & 0.731 & 0.745 & 0.794 \\
 Twin pair FE & YES & YES & YES & YES \\ \hline
\multicolumn{5}{c}{ Robust standard errors in parentheses} \\
\multicolumn{5}{c}{ *** p$<$0.01, ** p$<$0.05, * p$<$0.1} \\
\end{tabular}
